Help!

So back in November I went to my OB to talk about not being able to get pregnant for a year and a half. So he put me on clomid. I took it and did exactly what I was supposed to do when the time came in late December/early January. Today is my expected period but I have been having cramps for a week and feeling nauseous for about that long as well as well as sensitive nipples. I haven’t had any period symptoms since getting my period again after having my daughter in 2015. Is this because of the clomid? Is it my period? Is it not? I am so confused and so tired of feeling like I am always going to trow up!